Tutorial 10
Using the login object to control dialogue flow.
Instructions
Drag and arrange states onto the canvas so that you have the following setup:
Enter the following prompts into their respective states:
| sign_in | Please sign in. | |
| welcome | Welcome $user. | |
| great | Great $user, you used the login object to control branching. | |
| redo | Next time login as Sally. | |
| goodbye | Goodbye $user |
 |
The login object will present a list of names for the user to select from at run time. A variable
called "user" is then set to the selected name. The knowledge of the user's identity can be useful
in guiding dialogue flow, and personalizing prompts. In addition, this information is invaluable if
the application is being used for education and assessment. Select "Edit User List" from the "login" state's context menu to raise the login dialogue. |
Type each of the following names into the text entry field, followed by a return. They will then be
added to the list of names on the right:
Brian
Mary
Sally
Bill
Once you have entered the names, select "Ok" to exit the dialogue.
Brian
Mary
Sally
Bill
Once you have entered the names, select "Ok" to exit the dialogue.
Next, you need to configure the conditional "sally" state. A boolean Tcl expression must be placed
in each port. This is an expression which evaluates to either true or false (1 or 0). The ports
are tested from the left to the right at run time, and the first true port is the one which will
be used.
Double click on the left port of "sally", and enter the following expression:
$user == "Sally"
In the right port, simple enter the number "1". This is an expression that is always true. It is a good idea to always have a "1" port on conditional objects to ensure that the dialogue continues.
$user == "Sally"
In the right port, simple enter the number "1". This is an expression that is always true. It is a good idea to always have a "1" port on conditional objects to ensure that the dialogue continues.